let down

[Sepmre]

In September 2011, we took a blast from Hargreaves about how he had been supposedly let down by our medical staff in his time with us.

What does the underlined part mean?

Thanks

[emsr2d2]

In September 2011, we took a blast from Hargreaves about how he had been supposedly let down by our medical staff in his time with us.

What does the underlined part mean?

Thanks

"To blast" can mean to shout at someone, to complain loudly/vociferously. In this case, it sounds as if Hargreaves felt that he had been let down by the medical staff somewhere and, at some point later, he told someone (or various people) at that place that he felt he had been let down. He did so in a loud, possibly aggressive manner, leaving them in no doubt that he was not happy with his treatment.